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Appendix A. CSAT3 Orientation

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Appendix A. CSAT3 Orientation A.1 Determining True North and Sensor Orientation The orientation of the CSAT3 negative x-axis is found by reading a magnetic compass and applying the site-specific correction for magnetic declination; where the magnetic declination is the number of degrees between True North and Magnetic North. Magnetic declination for a specific site can be obtained from a USGS map, local airport, or through a NOAA web calculator (Section A.2). A general map showing magnetic declination for the Conterminous United States in 2004 is shown in FIGURE A-1. FIGURE A-1. Magnetic declination for the conterminous United States (2004) A-1

Section	Page
Revision and Copyright Information	1
Warranty	3
Assistance	4
Table of Contents	5
1. General	9
2. Specifications	9
2.1 Measurements	9
2.2 Output Signals	10
2.3 Physical Description	11
2.4 Power Requirements	12
3. Initial Setup	12
3.1 Factory Settings	12
3.2 DM Address	13
4. Installation	13
4.1 Orientation	13
4.2 Mounting	14
4.3 Leveling	16
4.4 Fine Wire Thermocouple	16
5. Wiring	16
6. CSAT3 Outputs	19
6.1 SDM Output	19
6.1.1 CRBasic Dataloggers	20
6.1.2 EDLOG Dataloggers	20
6.1.3 CR9000	20
6.2 RS-232 Output	21
6.3 Analog Output	21
7. Operational Principles	21
7.1 Embedded Code Version 4	21
7.2 Embedded Code Version 3	22
7.3 Effects of Crosswind on the Speed of Sound	23
8. CSAT3 Trigger	24
8.1 Sampling Modes	25
8.1.1 Single-Measurement Mode	26
8.1.2 Oversample Mode	26
9. Data Pipeline Delay	26
10. Datalogger Programming using SDM	27
10.1 CRBasic CSAT3 () Instruction	27
10.2 EDLOG SDM-CSAT3 (P107) Instruction	27
10.3 Datalogger Instruction Parameters	27
10.4 Diagnostic Word	30
10.5 SDMTrigger ()/SDM-Group Trigger (P110)	31
10.6 Example CRBasic Datalogger Program	31
10.7 Example EDLOG Datalogger Program	36
11. Maintenance	45
11.1 Wicks	46
11.2 Calibration	47
11.2.1 Cold Shifted Calibration	47
11.2.2 Test for Wind Offset	48
12. Select Backdoor Commands	50
Appendix A. CSAT3 Orientation	53
A.1 Determining True North and Sensor Orientation	53
A.2 Online Magnetic Declination Calculator	55
Appendix B. Serial Communications with the CSAT3	57
B.1 CSAT3 RS-232 Commands	57
B.2 CSAT3 Binary Data Output Format	59
B.3 Words 0 through 3	60
B.4 Word 4	61
B.5 CSAT3 RS-232 Status Format	61
Appendix C. CSAT3 Measurement Theory	63
C.1 Theory of Operation	63
C.1.1 Wind Speed	63
C.1.2 Temperature	63
Appendix D. SDM Communications and Long Signal Cables	67
D.1 Brief Description of SDM Clock Rates	67
D.2 CR3000 Example	68
D.3 CR23X Example	68